Question

A nurse is preparing to administer pentamidine 4 mg/kg 1M to a client who weighs 154 lb. Available is pentamidine 100 mg/mL for injection. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Answer 1

Correct Answers:

2.8

Rationale :

📏To calculate the correct dose, the client’s weight in pounds must first be converted to kilograms: 154 lb ÷ 2.2 = 70 kg.

🧪The prescribed dose is 4 mg/kg, so 4 mg × 70 kg = 280 mg total dose needed.

🧮Using the available concentration of 100 mg/mL, divide: 280 mg ÷ 100 mg/mL = 2.8 mL.

💉This calculation ensures accurate dosing of pentamidine and prevents underdosing or toxicity.

📌Core Message

Convert body weight to kilograms, multiply by the mg/kg dose, and divide by the drug concentration to calculate the volume to administer.

Answer 2

Correct Answers:

5

Rationale :

🧪The total daily dose is 150 mg, divided into 3 equal doses, which means each dose is 150 ÷ 3 = 50 mg.

💊The available concentration is 50 mg per 5 mL, so for 50 mg: 50 ÷ 50 = 1 unit, which equals 5 mL.

📏This confirms the client receives an accurate divided dose with each administration.

✅Using the available formulation ensures safe and appropriate medication delivery.

📌Core Message

Divide the total dose evenly, then use the concentration ratio to find the volume per dose.

Answer 3

Correct Answers:

0.75

Rationale :

🧪The prescribed dose is 7.5 mg, and the available concentration is 10 mg/mL.

📏To calculate the volume: 7.5 mg ÷ 10 mg/mL = 0.75 mL.

💉This exact measurement ensures proper delivery of morphine, minimizing risks like respiratory depression.

🔬Rounding to the nearest hundredth is appropriate for precision in high-alert medications.

📌Core Message

Use the formula: dose ÷ concentration to calculate mL for accurate administration.

Answer 4

Correct Answers:

1.1

Rationale :

🧪After reconstitution, the vial contains 225 mg/mL.

📏To give 250 mg: 250 ÷ 225 = 1.111 mL, which rounds to 1.1 mL.

💉This amount is drawn from the reconstituted vial and added to 50 mL of 0.9% NaCl for IV administration.

⚖️This method maintains therapeutic levels while avoiding overdosing.

📌Core Message

Use the post-reconstitution concentration to calculate the correct volume for accurate IV dosing.

Answer 5

Correct Answers:

4

Rationale :

⚖️To begin, convert the client's weight from pounds to kilograms: 132 lb ÷ 2.2 = 60 kg.

🧪The prescribed daily dose is 20 mg/kg, so the total daily dose is 60 kg × 20 mg = 1200 mg/day.

📤Since the medication is to be administered in two divided doses, each dose will be 1200 mg ÷ 2 = 600 mg.

💊Each capsule contains 150 mg, so 600 mg ÷ 150 mg = 4 capsules per dose.

📌Core Message

Convert weight to kilograms, calculate the total daily dose, divide by the number of doses, and then use the available capsule strength to determine the number of capsules per dose.

Answer 6

Correct Answers:

2500

Rationale :

🧪The total volume ordered is 2.5 L, and since 1 L = 1000 mL, convert: 2.5 × 1000 = 2500 mL.

📏This straightforward conversion is essential for accurate IV fluid administration.

💧This helps prevent fluid overload or insufficient hydration, especially in long infusions.

✅Proper conversion supports safe medication and fluid management.

📌Core Message

Convert liters to mL by multiplying by 1000 for accurate fluid calculations.

Answer 7

Correct Answers:

30

Rationale :

📏1 ounce = 30 mL, which is a standard conversion in drug calculations.

🧪This ensures the nurse understands both household and metric measurements.

🔍Using this value aids in converting non-standard units to precise metric dosages.

📘This is especially important for over-the-counter medications taken without exact mL measuring tools.

📌Core Message

1 oz = 30 mL is a standard conversion critical in oral medication calculations.

Answer 8

Correct Answers:

48

Rationale :

📏Convert 210 lb to kg: 210 ÷ 2.2 = 95.45 kg.

🧪Dosage: 5 mg/kg × 95.45 kg = 477.25 mg, round to 477 mg.

💉Volume = 477 ÷ 10 mg/mL = 47.7 mL, round to 48 mL.

🔍This provides an exact amount of gentamicin and prevents underdosing or toxicity.

📌Core Message

Weight-based doses require conversion to kg, then use dose ÷ concentration for volume.

Answer 9

Correct Answers:

125

Rationale :

📏Total volume = 3 L = 3000 mL, to be infused over 24 hours.

🧮Divide: 3000 ÷ 24 = 125 mL/hr.

💉This ensures continuous, steady infusion, which is crucial for fluid and electrolyte balance.

✅Setting the IV pump correctly helps avoid fluid volume overload or deficit.

📌Core Message

Hourly infusion rates are calculated by dividing total mL by time (hr) for pump settings.

Answer 10

Correct Answers:

0.4

Rationale :

🧪The ordered dose is 40 mg, and the available concentration is 100 mg/mL.

📏To calculate volume: 40 ÷ 100 = 0.4 mL.

💉This is a small volume and must be measured precisely, especially with anticoagulants like enoxaparin.

⚠️Administering incorrect amounts can lead to bleeding or insufficient anticoagulation.

📌Core Message

For subcutaneous medications, use dose ÷ concentration to calculate precise mL administration.

ATI Dosage Calculation RN Adult Medical Surgical

No.

1 :
A nurse is preparing to administer pentamidine 4 mg/kg 1M to a client who weighs 154 lb. Available is pentamidine 100 mg/mL for injection. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

3 :
A nurse is preparing to administer morphine 7.5 mg subcutaneous. Available is morphine injection 10 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)

6 :
A nurse is preparing to administer 0.45% sodium chloride 2.5 L IV to infuse over 24 hr. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

9 :
A nurse is preparing to administer dextrose 5% in 0.45% sodium chloride 3 L IV to infuse over 24 hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

10 :
A nurse is preparing to administer enoxaparin 40 mg subcutaneous for prevention of deep vein thrombosis. Available is enoxaparin 100 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

ATI Dosage Calculation RN Adult Medical Surgical

No.

1 : A nurse is preparing to administer pentamidine 4 mg/kg 1M to a client who weighs 154 lb. Available is pentamidine 100 mg/mL for injection. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

3 : A nurse is preparing to administer morphine 7.5 mg subcutaneous. Available is morphine injection 10 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)

6 : A nurse is preparing to administer 0.45% sodium chloride 2.5 L IV to infuse over 24 hr. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

9 : A nurse is preparing to administer dextrose 5% in 0.45% sodium chloride 3 L IV to infuse over 24 hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

10 : A nurse is preparing to administer enoxaparin 40 mg subcutaneous for prevention of deep vein thrombosis. Available is enoxaparin 100 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

1 :
A nurse is preparing to administer pentamidine 4 mg/kg 1M to a client who weighs 154 lb. Available is pentamidine 100 mg/mL for injection. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

3 :
A nurse is preparing to administer morphine 7.5 mg subcutaneous. Available is morphine injection 10 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest hundredth. Use a leading zero if it applies. Do not use a trailing zero.)

6 :
A nurse is preparing to administer 0.45% sodium chloride 2.5 L IV to infuse over 24 hr. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

9 :
A nurse is preparing to administer dextrose 5% in 0.45% sodium chloride 3 L IV to infuse over 24 hr. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

10 :
A nurse is preparing to administer enoxaparin 40 mg subcutaneous for prevention of deep vein thrombosis. Available is enoxaparin 100 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)